Motor-driven compressor

ABSTRACT

A motor-driven compressor in which an electric driving mechanism is capable of keeping high efficiency. The compressor includes an electric driving mechanism, a compression mechanism and a motor drive circuit. The electric driving mechanism is accommodated in a housing. The housing has a main body portion in a cylindrical shape, a bulging portion that bulges in a radially outward direction from the main body portion, and a partition wall. In the main body portion, a stator accommodation chamber is formed. In the stator accommodation chamber, a stator of the electric driving mechanism is accommodated. In the bulging portion, a cluster block accommodation chamber is formed. In the cluster block accommodation chamber, a cluster block is accommodated. A partition wall separates the stator accommodation chamber and the cluster block accommodation chamber in a radial direction. The main body portion and the partition wall support a stator core.

TECHNICAL FIELD

The present invention relates to a motor-driven compressor.

BACKGROUND ART

Japanese Patent Laid-Open No. 2010-59809 discloses a conventionalmotor-driven compressor (hereinafter, simply called a compressor). Thecompressor includes an electric driving mechanism, a compressionmechanism that is driven by the electric driving mechanism and performscompression of a refrigerant, and a motor drive circuit for driving theelectric driving mechanism.

The electric driving mechanism is accommodated in a housing. Theelectric driving mechanism has a stator, a rotor, a drive shaft, a leadwire and a cluster block. The stator has a stator core and a coilprovided at the stator core. The rotor is rotatably provided in thestator. The drive shaft is fixed to the rotor. The drive shaft drivesthe compression mechanism. The lead wire is connected to the coil. Thecluster block electrically connects the lead wire to the motor drivecircuit.

The housing has a main body portion in a cylindrical shape, and abulging portion that bulges in a radially outward direction from themain body portion. At the front of the main body portion, thecompression mechanism is accommodated. Further, at the rear of the mainbody portion, a stator accommodation chamber in which the stator isaccommodated is formed in an inside thereof. The stator core issupported in the stator accommodation chamber in the main body portion.For support of the stator core to the main body portion, shrinkagefitting or press fitting is generally adopted. The bulging portion isintegrated with the main body portion. The bulging portion forms acluster block accommodation chamber in an inside thereof. The clusterblock is accommodated in the cluster block accommodation chamber.

In the compressor, the motor drive circuit is provided at a rear side ofthe housing, and electric power is supplied to the coil from the motordrive circuit, whereby the electric driving mechanism rotates the driveshaft, and the compression mechanism is operated. Therefore, if thecompressor is mounted on a hybrid vehicle, the vehicle interior can beair-conditioned even when the engine is stopped.

However, in the conventional compressor as described above, the housingin which the bulging portion is located in the radially outwarddirection of the main body portion is adopted. Therefore, in thecompressor, stress that acts on the outer circumferential surface of thestator core becomes ununiform when the stator core is shrinkage-fittedinto the stator accommodation chamber of the housing, and circularity ofthe stator core after being fixed tends to be low. The same also appliesto the case of the stator core being press-fitted into the housing.Therefore, in this compressor, the electric driving mechanism hardlykeeps high efficiency.

The present invention has been made in the light of the conventionalcircumstances described above, and a problem to be solved is to providea motor-driven compressor in which an electric driving mechanism iscapable of keeping high efficiency.

SUMMARY OF THE INVENTION

A motor-driven compressor of the present invention comprises an electricdriving mechanism, a compression mechanism that is driven by theelectric driving mechanism, and performs compression of a refrigerant,and a motor drive circuit for driving the electric driving mechanism.

The electric driving mechanism has a stator, a rotor, a drive shaft, alead wire and a cluster block. The stator is accommodated in a housing,and has a stator core and a coil provided at the stator core. The rotoris rotatably provided in the stator. The drive shaft is fixed to therotor, and drives the compression mechanism. The lead wire is connectedto the coil. The cluster block electrically connects the lead wire tothe motor drive circuit.

The housing has a main body portion, a bulging portion and a partitionwall. The main body portion is in a cylindrical shape, and forms astator accommodation chamber in which the stator is accommodated, in aninside thereof. The bulging portion bulges in a radially outwarddirection from the main body portion, and forms a cluster blockaccommodation chamber in which the cluster block is accommodated, in aninside thereof. The partition wall separates the stator accommodationchamber and the cluster block accommodation chamber, in a radialdirection. The housing supports the stator core at the main body portionand the partition wall. Further, in the housing, the lead wire isdisposed across the stator accommodation chamber and the cluster blockaccommodation chamber.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view of a compressor of embodiment 1.

FIG. 2 is a sectional view seen from the arrows II-II in FIG. 1 relatingto the compressor of embodiment 1, and showing a state in which a rotorand a drive shaft are removed.

FIG. 3 is a sectional view of a compressor of embodiment 2.

FIG. 4 is a sectional view seen from the arrows IV-IV in FIG. 3 relatingto the compressor of embodiment 2 and showing a state in which a rotorand a drive shaft are removed.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Hereinafter, embodiments 1 and 2 in which the present invention isembodied will be described with reference to the drawings.

Embodiment 1

A compressor of embodiment 1 is used in an air-conditioning apparatusthat is mounted on a hybrid vehicle and performs temperature control ofa vehicle interior. As shown in FIG. 1, the compressor includes ahousing 1, an electric driving mechanism 3, a compression mechanism 5and a motor drive circuit 7.

The housing 1 is formed of a main housing 10, an end housing 12 and acover 14. The main housing 10 is in a bottomed cylindrical shape. Theend housing 12 is located at a front of the main housing 10 to close anopening of the main housing 10. The cover 14 is fixed to a rear end ofthe main housing 10.

In the main housing 10, a fixed block 9 is supported. A front portion ofthe housing 1 is configured by a front portion of the main housing 10that is located forward of the fixed block 9, and the end housing 12. Inthe front portion, a compression mechanism accommodation chamber 11 a isformed. In the compression mechanism accommodation chamber 11 a, thecompression mechanism 5 is housed.

Further, a main body portion 1 b in a cylindrical shape and a bulgingportion 1 c are configured by a rear portion of the housing 1, which islocated rearward of the fixed block 9. In the main body portion 1 b, astator accommodation chamber 11 b that continues in an axial directionto the compression mechanism accommodation chamber 11 a is formed. Astator 15 of the electric driving mechanism 3 is accommodated in thestator accommodation chamber 11 b. The bulging portion 1 c forms acluster block accommodation chamber 11 c that is located in a radiallyoutward direction of the stator accommodation chamber 11 b. A lead wire21 and a cluster block 23 are accommodated in the cluster blockaccommodation chamber 11 c.

The cover 14 is fixed to the rear end of the main housing 10 in such amanner as to form a motor drive circuit chamber 7 b between the cover 14and the main housing 10. In the motor drive circuit chamber 7 b, themotor drive circuit 7 is accommodated. Therefore, in the presentembodiment, the compression mechanism 5, the electric driving mechanism3, and the motor drive circuit 7 are disposed in this sequence side byside along an axial direction of a drive shaft 19 that will be describedlater.

The electric driving mechanism 3 has the stator 15, a rotor 17, thedrive shaft 19, the lead wire 21 and the cluster block 23. The stator15, the rotor 17 and the drive shaft 19 are accommodated in the statoraccommodation chamber 11 b. As shown in FIG. 2, the stator 15 has astator core 15 b and a coil 25 provided at the stator core 15 b.Further, on an outer circumferential surface of the stator 15, aplurality of refrigerant channels 15 a are formed between the outercircumferential surface of the stator 15 and the main housing 10. Therespective refrigerant channels 15 a are provided at positions atequiangular intervals with a center axis O of the rotor 17 as a center.As shown in FIG. 1, the rotor 17 is provided in the stator 15. The driveshaft 19 is fixed to the rotor 17. Thereby, the rotor 17 is rotatableintegrally with the drive shaft 19 in the stator 15.

A central portion of the fixed block 9 protrudes rearward, and a shafthole 9 a is formed in a center thereof. At a front side of the shafthole 9 a, a shaft seal device 27 and a bearing device 29 a are fixed tothe fixed block 9. A front side of the drive shaft 19 is insertedthrough the shaft hole 9 a. In an inside of the rear end of the mainhousing 10, a boss portion 31 a in a cylindrical shape is provided toprotrude toward the front side. The boss portion 31 a is provided with abearing device 29 b. The drive shaft 19 drives the compression mechanism5 that will be described later.

A connector 33 is provided at a front end side of the lead wire 21. Thelead wire 21 is connected to the coil 25 by the connector 33. A rear endside of the lead wire 21 is connected to the cluster block 23 via aconnection terminal 23 a that is accommodated in an inside of thecluster block 23. The cluster block 23 is connected to the motor drivecircuit 7 via a connection terminal 23 b.

The compression mechanism 5 has a fixed scroll 35 that is fixed to aninner circumferential surface of the main housing 10, and a movablescroll 37 that is disposed to face the fixed scroll 35. The fixed scroll35 is fixed to the fixed block 9 by a plurality of pins 39. The movablescroll 37 is disposed between the fixed block 9 and the fixed scroll 35.The fixed scroll 35 and the movable scroll 37 are meshed with eachother, and a compression chamber 41 is formed between both of them.

In a central portion of a rear surface of the movable scroll 37, a bossportion 31 b in a cylindrical shape is provided to protrude toward arear side. Further, a plurality of rotation preventing holes 43 areprovided to be recessed in an outer circumferential region of the rearsurface of the movable scroll 37. Rotation prevention rings 45 are fixedto the respective rotation preventing holes 43. On a front surface ofthe fixed block 9, a plurality of rotation prevention pins 40 areprovided to protrude toward the front side. The respective rotationprevention pins 40 roll in the rotation prevention rings 45respectively.

An eccentric shaft portion 19 a is formed to protrude at a front endportion of the drive shaft 19. The eccentric shaft portion 19 a isrotatably inserted into a bush 47 with a balancer that is providedbetween the fixed block 9 and the movable scroll 37. A bearing device 29c is provided between the bush 47 with a balancer and the boss portion31 b.

A discharge chamber 49 is formed between the fixed scroll 35 and the endhousing 12. In the fixed scroll 35, a discharge port 49 a that allowsthe compression chamber 41 to communicate with the discharge chamber 49is formed. Further, at a front end surface of the fixed scroll 35, adischarge reed valve not illustrated that opens and closes the dischargeport 49 a, and a retainer 51 that regulates a lift amount of thedischarge reed valve are fixed. In the end housing 12, a discharge port49 b is provided to penetrate through the end housing 12.

As shown in FIG. 1 and FIG. 2, a partition wall 53 is provided betweenthe main body portion 1 b and the bulging portion 1 c in the mainhousing 10. At a stator accommodation chamber 11 b side of the partitionwall 53, a cylindrical surface 53 a that is coaxial with the statoraccommodation chamber 11 b is formed. The partition wall 53 supports thestator core 15 b that is provided in the stator accommodation chamber 11b.

Further, as shown in FIG. 1, an insertion path 55 is formed in theradial direction in the partition wall 53 near the compression mechanism5 so as to allow the cluster block accommodation chamber 11 c and thestator accommodation chamber 11 b to communicate with each other. Thepartition wall 53 separates the stator accommodation chamber 11 b andthe cluster block accommodation chamber 11 c except for the insertionpath 55. The lead wire 21 is inserted through the insertion path 55 inthe radial direction, and is disposed across the cluster blockaccommodation chamber 11 c and the stator accommodation chamber 11 b.

A suction port 49 c is formed at a rear end of the main housing 10.Thus, the stator accommodation chamber 11 b is connected to anevaporator not illustrated by piping that is connected to the suctionport 49 c. The evaporator is connected to an expansion valve notillustrated by piping, and the expansion valve is connected to acondenser not illustrated by piping. Meanwhile, the discharge chamber 49is connected to the condenser by the piping that is connected to thedischarge port 49 b. The compressor, the evaporator, the expansion valveand the condenser configure a refrigeration circuit of anair-conditioning apparatus for a vehicle.

In this compressor, the driver of the vehicle performs an operation tothe air-conditioning apparatus, whereby power is supplied to the motordrive circuit 7 from an external battery or the like, and power issupplied to the coil 25 from the motor drive circuit 7 via theconnection terminal 23 b, the cluster block 23, the lead wire 21 and theconnector 33. Thereby, the electric driving mechanism 3 is operated.Thereby, the rotor 17 rotates with the center axis O as the center, andthe drive shaft 19 rotates. Therefore, the compression mechanism 5 isoperated. Namely, the movable scroll 37 revolves around the drive shaft19, and the compression chamber 41 gradually reduces in volume.Therefore, the refrigerant from the evaporator is sucked into thecompression chamber 41 from the stator accommodation chamber 11 b. Atthis time, the refrigerant in the stator accommodation chamber 11 bcools the electric driving mechanism 3. The refrigerant that iscompressed in the compression chamber 41 is discharged into thedischarge chamber 49, and is discharged to the condenser. In thismanner, according to the air-conditioning apparatus having thecompressor, even when the engine is stopped, the vehicle interior can beair-conditioned.

The compressor is assembled as follows. First, the main housing 10 isheated, and the entire main housing 10 is expanded in the radiallyoutward direction. Thereby, an inside diameter of the main body portion1 b in the main housing 10 becomes slightly larger than an outsidediameter of the stator 15. Therefore, in this state, the stator 15 isinserted into the stator accommodation chamber 11 b of the main bodyportion 1 b. Subsequently, the main housing 10 is returned to a roomtemperature, and the main body portion 1 b is shrunk. In this manner,the stator 15 is shrinkage-fitted into the main body portion 1 b.

As shown in FIG. 1 and FIG. 2, at this time, in this compressor, thepartition wall 53 that is provided between the main body portion 1 b andthe bulging portion 1 c restrains deformation of the main body portion 1b at the time of shrinkage-fitting the stator 15 into the statoraccommodation chamber 11 b. Therefore, stress that acts on the outercircumferential surface of the stator core 15 b easily becomes uniform.In particular, in this compressor, a wall surface at the statoraccommodation chamber 11 b side, of the partition wall 53 is thecylindrical surface 53 a that is coaxial with the stator accommodationchamber 11 b, and therefore, the stress that acts on the outercircumferential surface of the stator core 15 b is more uniform.Therefore, in this compressor, the circularity of the stator core 15 bafter shrinkage-fitting can be kept high.

Accordingly, in this compressor, the electric driving mechanism 3 cankeep high efficiency.

In this compressor, the lead wire 21 is connected to the coil 25 by theconnector 33. The connector 33 easily connects the lead wire 21 to thecoil 25, and therefore, assembly of the compressor is facilitated.

Further, in this compressor, the lead wire 21 that is inserted throughthe insertion path 55 can be connected to the coil 25 at the compressionmechanism 5 side. Therefore, a length in the axial direction of thiscompressor can be made shorter, and mountability to the vehicle or thelike can be enhanced more, than in the case of connecting the lead wire21 to the coil 25 at the motor drive circuit 7 side from the clusterblock 23.

Embodiment 2

As shown in FIG. 3, in a compressor of embodiment 2, a slit 57 thatextends in an axial direction is formed in a partition wall 54. The slit57 allows the stator accommodation chamber 11 b and the cluster blockaccommodation chamber 11 c to communicate with each other.

Further, the cluster block 23 is fixed to the stator core 15 b via afitting member 59 of a resin. The fitting member 59 is located in theslit 57.

Further, in this compressor, a plurality of refrigerant channels 61 areformed in the inner circumferential surface of the main body portion 1b. The slit 57 and the respective refrigerant channels 61 are spacedequiangularly from one another in a circumferential direction of themain body portion 1 b. Further, the slit 57 and the respectiverefrigerant channels 61 are formed to have widths equal to one anotherin the circumferential direction of the main body portion 1 b. The otherconfiguration is similar to that of embodiment 1.

In this compressor, by inserting the fitting member 59 through the slit57, the cluster block 23 can be assembled in a state fixed to the statorcore 15 b. Therefore, in this compressor, the stator 15 and the clusterblock 23 can be accommodated in the housing 10 at the same time, andassembly is easy.

Further, as shown in FIG. 4, in this compressor, the slit and therespective refrigerant channels 61 are spaced equiangularly from oneanother in the circumferential direction of the second housing 11 b.Further, the slit 57 and the respective refrigerant channels 61 areformed to have widths equal to one another in the circumferentialdirection of the second housing 11 b. Therefore, the stress that acts onthe outer circumferential surface of the stator core 15 b can be madeuniform more reliably. Therefore, in this compressor, the circularity ofthe stator core 15 b after fixation can be kept higher. The otheroperation effect is similar to that of embodiment 1.

While the present invention is described in conformity with embodiments1 and 2 in the above, the present invention is not limited toembodiments 1 and 2 described above, and it goes without saying that thepresent invention can be applied by being properly changed within therange without departing from the gist of the present invention.

For example, in each of the compressors of embodiment 1 and 2, the cover14 is provided at the rear of the main body portion 1 b, and thecompression mechanism 5, the electric driving mechanism 3 and the motordrive circuit 7 are disposed in this sequence side by side along theaxial direction of the drive shaft 19. Instead of this, the cover 14 maybe provided at an upper part of the main body portion 1 b.

The present invention is usable in an air-conditioning apparatus of avehicle, or the like.

REFERENCE NUMBER LIST

-   -   1 . . . housing (10 . . . main housing, 12 . . . end housing, 14        . . . cover)    -   1 b . . . main body portion    -   1 c . . . bulging portion    -   3 . . . electric driving mechanism    -   5 . . . compression mechanism    -   7 . . . motor drive circuit    -   11 b . . . stator accommodation chamber    -   11 c . . . cluster block accommodation chamber    -   15 . . . stator    -   15 a, 61 . . . refrigerant channel    -   15 b . . . stator core    -   17 . . . rotor    -   19 . . . drive shaft    -   21 . . . lead wire    -   23 . . . cluster block    -   25 . . . coil    -   33 . . . connector    -   53, 54 . . . partition wall    -   53 a . . . cylindrical surface    -   55 . . . insertion path    -   57 . . . slit    -   59 . . . fitting member

1. A motor-driven compressor comprising an electric driving mechanism, acompression mechanism that is driven by the electric driving mechanism,and performs compression of a refrigerant, and a motor drive circuit fordriving the electric driving mechanism, wherein the electric drivingmechanism has a stator that is accommodated in a housing, and has astator core and a coil provided at the stator core, a rotor rotatablyprovided in the stator, a drive shaft that is fixed to the rotor anddrives the compression mechanism, a lead wire connected to the coil, anda cluster block for electrically connecting the lead wire to the motordrive circuit, the housing has a main body portion in a cylindricalshape that forms a stator accommodation chamber in which the stator isaccommodated in an inside thereof, a bulging portion that bulges in aradially outward direction from the main body portion, and forms acluster block accommodation chamber in which the cluster block isaccommodated in an inside thereof, and a partition wall that separatesthe stator accommodation chamber and the cluster block accommodationchamber in a radial direction, and the housing supports the stator coreat the main body portion and the partition wall, and has the lead wiredisposed across the stator accommodation chamber and the cluster blockaccommodation chamber.
 2. The motor-driven compressor according to claim1, wherein a wall surface at a side of the stator accommodation chamber,of the partition wall is a cylindrical surface that is coaxial with themain body portion.
 3. The motor-driven compressor according to claim 1,wherein between the stator accommodation chamber and the cluster blockaccommodation chamber, an insertion path that allows the lead wire to beinserted therethrough at a side of the compression mechanism is formed,and the partition wall separates the stator accommodation chamber andthe cluster block accommodation chamber except for the insertion path.4. The motor-driven compressor according to claim 1, wherein a wallsurface at a side of the stator accommodation chamber, of the partitionwall is a cylindrical surface that is coaxial with the main bodyportion, between the stator accommodation chamber and the cluster blockaccommodation chamber, an insertion path that allows the lead wire to beinserted therethrough at a side of the compression mechanism is formed,and the partition wall separates the stator accommodation chamber andthe cluster block accommodation chamber except for the insertion path.5. The motor-driven compressor according to claim 1, wherein a wallsurface at a side of the stator accommodation chamber, of the partitionwall is a cylindrical surface that is coaxial with the main bodyportion, between the stator accommodation chamber and the cluster blockaccommodation chamber, an insertion path that allows the lead wire to beinserted therethrough at a side of the compression mechanism is formed,the partition wall separates the stator accommodation chamber and thecluster block accommodation chamber except for the insertion path, andthe lead wire is connected to the coil by a connector.
 6. Themotor-driven compressor according to claim 1, wherein the cluster blockis fixed to the stator core via a fitting member, and in the partitionwall, a slit is formed, which allows the stator accommodation chamberand the cluster block accommodation chamber to communicate with eachother, allows the fitting member to be inserted therethrough, andextends in an axial direction of the drive shaft.
 7. The motor-drivencompressor according to claim 1, wherein a wall surface at a side of thestator accommodation chamber, of the partition wall is a cylindricalsurface that is coaxial with the main body portion, the cluster block isfixed to the stator core via a fitting member, and in the partitionwall, a slit is formed, which allows the stator accommodation chamberand the cluster block accommodation chamber to communicate with eachother, allows the fitting member to be inserted therethrough, andextends in an axial direction of the drive shaft.
 8. The motor-drivencompressor according to claim 1, wherein the cluster block is fixed tothe stator core via a fitting member, in the partition wall, a slit isformed, which allows the stator accommodation chamber and the clusterblock accommodation chamber to communicate with each other, allows thefitting member to be inserted therethrough, and extends in an axialdirection of the drive shaft, in the housing, a plurality of refrigerantchannels that allow the refrigerant to circulate in the axial directionof the drive shaft are formed between the housing and the stator core,and the slit and the respective refrigerant channels are equiangularlyspaced from one another in a circumferential direction of the housing.9. The motor-driven compressor according to claim 1, wherein the clusterblock is fixed to the stator core via a fitting member, in the partitionwall, a slit is formed, which allows the stator accommodation chamberand the cluster block accommodation chamber to communicate with eachother, allows the fitting member to be inserted therethrough, andextends in an axial direction of the drive shaft, in the housing, aplurality of refrigerant channels that allow the refrigerant tocirculate in the axial direction of the drive shaft are formed betweenthe housing and the stator core, and the slit and the respectiverefrigerant channels are formed to have widths equal to one another in acircumferential direction of the housing.
 10. A motor-driven compressorcomprising an electric driving mechanism, a compression mechanism thatis driven by the electric driving mechanism, and performs compression ofa refrigerant, and a motor drive circuit for driving the electricdriving mechanism, wherein the electric driving mechanism has a statorthat is accommodated in a housing, and has a stator core and a coilprovided at the stator core, a rotor rotatably provided in the stator, adrive shaft that is fixed to the rotor and drives the compressionmechanism, a lead wire connected to the coil, and a cluster block forelectrically connecting the lead wire to the motor drive circuit, thehousing has a main body portion in a cylindrical shape that forms astator accommodation chamber in which the stator is accommodated in aninside thereof, a bulging portion that bulges in a radially outwarddirection from the main body portion, and forms a cluster blockaccommodation chamber in which the cluster block is accommodated in aninside thereof, and a partition wall that separates the statoraccommodation chamber and the cluster block accommodation chamber in aradial direction, the housing supports the stator core at the main bodyportion and the partition wall, and has the lead wire disposed acrossthe stator accommodation chamber and the cluster block accommodationchamber, a wall surface at a side of the stator accommodation chamber,of the partition wall is a cylindrical surface that is coaxial with themain body portion, between the stator accommodation chamber and thecluster block accommodation chamber, an insertion path that allows thelead wire to be inserted therethrough at a side of the compressionmechanism is formed, the partition wall separates the statoraccommodation chamber and the cluster block accommodation chamber exceptfor the insertion path, the compression mechanism, the electric drivingmechanism and the motor drive circuit are disposed in this sequence sideby side along an axial direction of the drive shaft, and the lead wireis connected to the coil located at a side of the compression mechanismby a connector.
 11. The motor-driven compressor according to claim 10,wherein in the housing, a plurality of refrigerant channels that allowthe refrigerant to circulate in the axial direction of the drive shaftare formed between the housing and the stator core, and the respectiverefrigerant channels are equiangularly spaced from one another in acircumferential direction of the housing.
 12. A motor-driven compressorcomprising an electric driving mechanism, a compression mechanism thatis driven by the electric driving mechanism, and performs compression ofa refrigerant, and a motor drive circuit for driving the electricdriving mechanism, wherein the electric driving mechanism has a statorthat is accommodated in a housing, and has a stator core and a coilprovided at the stator core, a rotor rotatably provided in the stator, adrive shaft that is fixed to the rotor and drives the compressionmechanism, a lead wire connected to the coil, and a cluster block forelectrically connecting the lead wire to the motor drive circuit, thehousing has a main body portion in a cylindrical shape that forms astator accommodation chamber in which the stator is accommodated in aninside thereof, a bulging portion that bulges in a radially outwarddirection from the main body portion, and forms a cluster blockaccommodation chamber in which the cluster block is accommodated in aninside thereof, and a partition wall that separates the statoraccommodation chamber and the cluster block accommodation chamber in aradial direction, the housing supports the stator core at the main bodyportion and the partition wall, and has the lead wire disposed acrossthe stator accommodation chamber and the cluster block accommodationchamber, a wall surface at a side of the stator accommodation chamber,of the partition wall is a cylindrical surface that is coaxial with themain body portion, the cluster block is fixed to the stator core via afitting member, in the partition wall, a slit is formed, which allowsthe stator accommodation chamber and the cluster block accommodationchamber to communicate with each other, allows the fitting member to beinserted therethrough, and extends in an axial direction of the driveshaft, in the housing, a plurality of refrigerant channels that allowthe refrigerant to circulate in the axial direction of the drive shaftare formed between the housing and the stator core, the slit and therespective refrigerant channels are equiangularly spaced from oneanother and are formed to have widths equal to one another in acircumferential direction of the housing, the compression mechanism, theelectric driving mechanism and the motor drive circuit are disposed inthis sequence side by side along the axial direction of the drive shaft,and the lead wire is connected to the coil located at a side of thecompression mechanism.
 13. The motor-driven compressor according toclaim 12, wherein between the stator accommodation chamber and thecluster block accommodation chamber, an insertion path that allows thelead wire to be inserted therethrough at a side of the compressionmechanism is formed, the partition wall separates the statoraccommodation chamber and the cluster block accommodation chamber exceptfor the insertion path, and the lead wire is connected to the coil by aconnector.
 14. The motor-driven compressor according to claim 1, whereinthe compression mechanism, the electric driving mechanism and the motordrive circuit are disposed in this sequence side by side along an axialdirection of the drive shaft, and the lead wire is connected to the coillocated at a side of the compression mechanism.